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RMO FINAL Flashcards

1
Q

Under certain circumstances is it ok to chain an exit door?

Yes, to keep your building safe from intruders

Yes, to keep students from leaving school
Mel

No, it is never of (FDNY)

Both A and B are correcT

A

No, it is never of (FDNY)

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2
Q

How would you calibrate a thermometer?

Place the thermometer in a cup of ice water

Place the thermometer in a cup of hot water

Place the thermometer in superheated steam

Compare temperature to another thermometer

A

Place the thermometer in a cup of ice water

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3
Q

What device automatically controls the speed of a steam turbine?

Governor valve

Gimpel valve

Sentinel valve

Main steam valve

A

Governor Valve

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4
Q

What happens when a steam turbine reaches critical speed?

Turbine will shut down

Turbine will vibrate violently

Turbine will slow down

Turbine will speed up

A

Turbine will vibrate violently

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5
Q

Superheat on the suction line has been increasing gradually for over a week. What could
be the cause?

Leak in the system

System is overcharged

Scale is clogged in the orifice

A

Leak in the system

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6
Q

A cold front is coming into the area. What would it cause liquid line solenoid to do?

Close and go off on low pressure

Close and go off on high pressure

A

Close and go off on low pressure

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7
Q

What is the sight glass on a compressor used for?

Check refrigerant level

Check oil level

A

Check oil level

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8
Q

Shader valve stem caps protect against all except?

Air getting into the system

Refrigerant leaking of the system

Oil leaking out of the system

Damage to the valve

A

Air getting into the system

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9
Q

A motor winding is touching the inside of the motor housing. This could result in:

Motor would overheat and shut down

Shock may occur to personnel

Motor would speed up

Motor would slow down

A

Shock may occur to personnel

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10
Q

An engineer suspects a short of the motor windings have caused the motor to trip on
overload. The engineer should use what instrument to check the motor:

Capacitor

Voltmeter

Ohmmeter

Ammeter

A

Ohmmeter

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11
Q

How many BTU’s are removed in a 30 ton system:

12,000 BTU’s per hour

360,000 BTU’s per minute

12,000 BTU’s per minute

360,000 BTU’s per hour

A

360,000 BTU’s per minute

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12
Q

An engineer is requested to replace a gauge on the high side of the system. The pressure
graduation rate should be:

At least 1.2 times the design pressure

Design pressure

A compound gauge

Same as low side pressure

A

At least 1.2 times the design pressure

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13
Q

An automatic expansion valve maintains a constant:

Evaporator pressure drop

Evaporator superheat

Refrigerant flow

Evaporator pressure

A

Evaporator pressure

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14
Q

If the air louvres below the fans in an induced draft cooling tower become clogged the
rest would be:

A decrease in make up water supply

Higher return water temperature

Lower return water temperature

A lower condenser approach

A

Higher return water temperature

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15
Q

You have a cold front and there is a sudden drop in temperature. The thermostat will cause solenoid valve to:

Close and pump the compressor down and shut down on low pressure

Close and the compressor will stop on high pressure

Open and compressor pumps down and goes off on high pressure

Open and compressor will continue to run at a reduced speed

A

Close and pump the compressor down and shut down on low pressure

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16
Q

Cross connections and standpipe risers must be painted:

Green

Red

Yellow

Green with yellow stripe

A

Red

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17
Q

Ir a sprinkler system is offine for two days how often do you need to inspect it until it is returned back to service?

Only in the morning not at night until restored

Only in the evening not the morning until restored

Continuously 24 hours a day until system is restored

12 hours a day until system is restored

A

Continuously 24 hours a day until system is restored

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18
Q

The only refrigerant/temperature chart avallable to a refrigerant engineer lists thg
temperature in degrees Celsius. If the chart indicates a celsius temperature of 5 degrees the
equivalent in Fahrenheit is?

18.4 degrees

39.2 degrees

41 degrees

27 degrees

A

41 degrees

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19
Q

In the picture below what does the equipment detect?

Carbon Dioxide

Oxygen

Halogen

Refrigerant leaks

A

Halogen

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20
Q

In a building with a multizone standpipe system, how does each zone get supplied with
water?

Each zone will be connected to the main water supply

It will supply only the highest standpipe zone

Each zone will have its own automatic water supply

It will supply only the lowest standpipe zone

A

Each zone will have its own automatic water supply

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21
Q

Which service valve should be installed to isolate a dual pressure relief valve while
keeping system in service?

Two way valve

Three way valve

Plug valve

Stop valve

A

Three Way Valve

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22
Q

When will the BTU’s exchanged be the greatest?

High evaporator temperature, low condenser temperature

High evaporator temperature, high condenser temperature

Low evaporator temperature, low condenser temperature

Low evaporator temperature, high condenser temperature

A

Low evaporator temperature, high condenser temperature

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23
Q

You find that the check valve on a centrifugal pump is leaking. When would the most
damage be caused to the pump?

On shutdown of the pump

On startup of the pump

When another pump is turned on

When servicing the pump

A

On startup of the pump

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24
Q

When you are finished leak testing with R22 and nitrogen the next step would be?

Vent refrigerant and nitrogen to open air

Remove refrigerant and nitrogen with recovery tank

Add refrigerant back into system

Add refrigerant if needed and put system back online

A

Vent refrigerant and nitrogen to open air

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25
Q

What is the device used to measure the speed of a turbine?

Governor

Gimpel valve

Look

Tachometer

First stage nozzle gauge

A

Tachometer

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26
Q

The condenser pump is on the first floor and not running. The pressure gauge shows 55
psi. There is 15 feet for each floor. What floor is the cooling tower on?

10
12
6
8

A

8

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27
Q

There is 7.48 gallons per cubic foot. How many gallons of water are in a pipe 8 feet in
diameter and 10 feet long?

26
80
3758
748

A

3758

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28
Q

A technician has been asked to estimate the cost of operating a 5 horse power motor.
Because the plant is billed by energy consumed as kilowatt-hours, the technician will have to
calculate the conversion. The equivalent in energy of a 5 horse power motor operating for 9 hours in kilowatt-hours is closet to:

33.6
4.79
3.73
11.9

A

33.6

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29
Q

A circuit breaker has a similar function as what?

A fuse

A solenoid

A resistor

A relay

A

A Fuse

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30
Q

How do you start a centrifugal chiller?

Start the chilled water pump, start condenser water pump, start compressor, check oil,
start cooling tower

Start the chilled water pump, start condenser water pump, check oil, start compressor,
start cooling tower

Start cooling tower, check oil, start compressor, start the chilled water pump, start
condenser water pump

Start the chilled water pump, start condenser water pump, check oil, start cooling tower,
start compressor

A

Start the chilled water pump, start condenser water pump, check oil, start cooling tower,
start compressor

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31
Q

What does a wiring diagram display?

Wiring of components

Wiring of switches only

Switch functions

All of the above

A

Wiring of components

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32
Q

Filter driers remove?

Air and acids

Moisture and particles

Oil and acids

Moisture and air

A

Moisture and particles

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33
Q

Show a picture of an insulated pump and ask what is this pump?

Centrifugal pump

Reciprocating pump

Centrifugal chill water pump

Condenser pump

A

Centrifugal chill water pump

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34
Q

If 29.92” HG is equal to 14.7 PSIA then 26” HG converts to what in PSIA?

13
12.77
30.3
7.5

d. 7.5

A

12.77

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35
Q

When charging refrigerant on the low side of a reciprocating machine with manifold
gauge what is the position of the manifold?

High and low side backseated

High and low side frontseated

High side backseated low side frontseated

High side frontseated low side backseated

A

High side frontseated low side backseated

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36
Q

You are the engineer running a 2,000 ton steam driven turbine centrifugal refrigeration
system supplying chilled water to a college campus with multiple buildings. You are supplying 45
degree chilled water. All the buildings are satisfied except one building. What action should the
engine do?

Put an additional chilled water pump online

Lower the set point from 46 degrees to 40 degrees

Add additional make up water to the cooling tower

A

Put an additional chilled water pump online

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37
Q

The cooling medium for a cooling tower is?

Air

Water

Air and water

Tower fan

A

Air

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38
Q

The charge in a TEV sensing bulb is?

Non flammable non toxic

similar to refrigerant in system

Highly toxic highly flammable

Different type of refrigerant than in system

A

similar to refrigerant in system (FDNY)

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39
Q

What tvpe of sprinkler system needs inspecting?

Automatic

Non-automatic

Residential

Commercial, hotel & office buildings

A

AUTOMATIC

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40
Q

You are performing hot works near a sprinkler head. What can You do to prevent the fire alarm from going off?

Take the building offline

Drain the sprinkler system in that area

Put a non-combustible barrier to protect the sprinkler head

Perform hot works in service area

A

Put a non-combustible barrier to protect the sprinkler head

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41
Q

How long does it take to warm up a steam turbine?

10-15 minutes

30-40 minutes

No less than 60 minutes

Doesn’t need warm-up

A

10-15 minutes

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42
Q

Why is a pressure relief valve better than a fusible plug?

Less costly

Minimizes refrigerant loss

Can be tested

Adjustable

A

Minimizes refrigerant loss

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43
Q

What is the state of refrigerant entering the compressor on a reciprocating machine?

Vapor

Superheated vapor

Saturated vapor

Liquid

A

Superheated vapor

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44
Q

In the absence of water chemical treatment of a cooling tower?

Drain the tower every one to two weeks & replace with fresh water

Punch tubes every week

Clean condenser pump strainers

None of the above

A

Drain the tower every one to two weeks & replace with fresh water

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45
Q

What is ammonia’s refrigerant ASHRAE classification?

A1
B3
B2
A3

A

B2

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46
Q

What is the function of a safety head on a compressor?

Capacity control

Prevents liquid slugging from damaging the valve plate

Purge air from cylinders

Prevent friction

A

Prevents liquid slugging from damaging the valve plate

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47
Q

When is a chemical fire extinguisher system needed?

Where water is not sufficient

Pre action system

Deluge system

A

Where water is not sufficient

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48
Q

What is most accurate about fire alarm books?

Must be kept on premises within 1 year from log of last entry

Must be kept in the fire alarm panel

Must be kept in the building managers office

Must be kept on the premises no less than five years

A

Must be kept in the fire alarm panel

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49
Q

What is the volume of a box 12”x12”x12” measure?

1728 inches

1728 square inches

1 cubic foot

144 cubic feet

A

1 cubic foot

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50
Q

A condenser pump is supplied with 85 degree water from a cooling tower and returns to
tower at 88 degrees. Engineer is sure the condenser tubes are clean and free of obstructions,
condenser has high condenser pressure. The reason for this could be?

Overcharge of refrigerant

Undercharge of refrigerant

Thermostat is damaged

Wide open water regulating valve

A

Overcharge of refrigerant

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51
Q

Fireproof decorations in buildings are useful for?

Seasonal purposes

Don’t catch fire in an emergency

Usually energy efficient

Help reduce heat load

A

Don’t catch fire in an emergency

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52
Q

What is the lowest temperature a cooling tower can be?

Ambient temperature

Dry bulb temperature

Wet bulb temperature

Between dry bulb and wet bulb

A

Wet bulb temperature

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53
Q

Manifold hoses should be equipped with?

Quick disconnects

Low loss fittings

Schrader valves

Service apertures

A

Low loss fittings

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54
Q

Water regulating valves are used to?

Vary flow based on water temperature

Maintain refrigerant temperature

Maintain condenser pressure to a pre-determined level

A

Maintain condenser pressure to a pre-determined level

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55
Q

Which of the following does not require flame resistant treatment?

Decorations in a hotel lobby

Decorations in a building lobby

Art work in a museum

A heavy curtain in a theater

A

Art work in a museum

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56
Q

Regardless of the ASHRAE refrigerant classification in use, in the event of a refrigerant
escaping the engineer should be aware of?

Refrigerant fire

Refrigerant toxicity

Asphyxiation

A

Asphyxiation

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57
Q

What type of refrigerant is found inside the machines gauges?

R-134A

Same type of refrigerant inside the machine

R-22

Glycol

A

Same type of refrigerant inside the machine

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58
Q

If resistance is cut in half, what happens to the power factor?

Gets cut by half

Increases by a factor of two

Decreases by a factor of two

Increased by half

A

Increases by a factor of two

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59
Q

What are pre hot works procedures performed prior to hot works?

Check area once a day leading up to hot works

Check area one week prior to hot works

Check area day of hot works

Check area day after hot works

A

Check area once a day leading up to hot works

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60
Q

A chilled water system has an air cooled condensing unit on a roof during cold weather
has what type of protection?

Glycol running through it

Heater coil

Air limiting device

Resistor

A

Air limiting device

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61
Q

What is a compressor safety head?

A pressure relief on the low side

Cylinder head with a pressure relief on the high side

A spring on the valve plate

Rupture disc

A

A spring on the valve plate

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62
Q

Standpipe certificate should be available for?

FDNY & OSHA

FDNY and building inspector

FDNY and EPA

FDNY and NFPA

A

FDNY and building inspector

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63
Q

Which of the following does not require flame resistant treatment?

Decorations in a hotel lobby

Decorations in a building lobby

Art work in a museum

A heavy curtain in a theater

A

Art work in a museum

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64
Q

A FDNY permit is required to conduct hot works for?
Brazing

Welding

Use of oxygen and flammable gas

All of the above

A

Use of oxygen and flammable gas

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65
Q

FDNY is most concerned with which ASHRAE refrigerant classification?

A1
B2
A3
B1

A

A3

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66
Q

How long must a Fire alarm log book be kept?

5 years

1 year from last entry

6 months

3 years

A

3 YEARS

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67
Q

What is the minimum requirement an engineer needs to log readings?

Every 2 hours

Once per shift

Every hour

Every 4 hours

A

Once per shift

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68
Q

You are the only engineer on duty with a machine running. A vice president tells you to shovel snow. What should you do?

Call your union rep

Shovel snow

Do not leave building

Shovel but check the machine regularly

A

Do not leave building

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69
Q

How often must you do emergency power testing?

Weeklv

Bi-weekly

Annually

Monthly

A

Monthly

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70
Q

What is the responsibility of a B29 COF holder?

Maintain the battery system

Test the battery system

Inspect the battery system

Repair minor problems

A

Inspect the battery system

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71
Q

Why is a refrigerant gauge called a compound gauge?

You can read the pressure on the high side and the low side

You can read the temperature and pressure

It has scales for different types of refrigerant

At reads positive pressure and vacuum

A

At reads positive pressure and vacuum

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72
Q

What is not required to be serviced annually?

Fire extinguishers

Fire pump motors

Compressors

Diesel engine systems

A

Compressors

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73
Q

What is the advantage of a shell and tube condenser, as opposed to a shell and coil
condenser?

Easier to clean

Prevents less leaks

Better heat transfer

Less efficient

A

Better heat transfer

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74
Q

Fusible plugs on a condenser?

Release refrigerant by pressure

The melting point is marked on it

Can be back seated

Are not allowed by code

A

The melting point is marked on it

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75
Q

How much extra refrigerant can be stored in a machine room?

20% above the normal charge

220 Ibs

The amount equal to the design pressure

330 lb

A

330 lbs

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76
Q

What is used on an outside pipe to prevent it from freezing?

Capacitor

Resistor

Heater coil

Transformer

A

Resistor

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77
Q

Of the following centrifugal chillers are best characterized as?

High tonnage, low pressure machines

Low tonnage, high pressure machine

High tonnage, high pressure machine

Low tonnage, low pressure machine

A

High tonnage, low pressure machines

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78
Q

As an engineer you notice pressure drops across the evaporator. You check and notice the external equalizer line is disconnected. What will occur in the evaporator?

Evaporator will flood

Evaporator will starve

Evaporator will stabilize

Evaporator will be unaffected

A

Evaporator will flood

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79
Q

When entering Phase Il fireman’s service, what statement is correct?

Does not need a special key

Can only be used by a firefighter

The elevator operator is the only person that could control the elevator

Must be tested semi-annually

A

The elevator operator is the only person that could control the elevator

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80
Q

What is the most widely used regulation book by operating engineers is?

OSHA

EPA

BOMA

NFPA

A

EPA

81
Q

What type of refrigerant do you need FDNY approval for?

Ammonia
R-22
Propane
R-134A

A

PROPANE

82
Q

Centrifugal pressure is determined by?

Speed of motor

Variable guide vanes

Design speed

Electrical voltage

A

Speed of motor

83
Q

A single phase 208 VAC circuit has 2 hot wires the third is the?

Spare wire

Ground

Control wire

Common

A

Ground

84
Q

Liquid refrigerant that has passed through a metering device is a?

High pressure liquid

Sub cooled liquid

Low pressure saturated liquid

Low pressure vapor

A

Low pressure saturated liquid

85
Q

With a 75 degree dry bulb and a 73 degree wet bulb the relative humidity is?

Normal

Very low

100% relative humidity

Very high

A

Very high

86
Q

After recovering liquid refrigerant from a centrifugal chiller the next step is to?

Blow the system out with nitrogen

Pull a deep vacuum

Recover vapor

Leak Test system

A

Recover vapor

87
Q

Where is the muffler located?

Between the compressor and condenser

Between the evaporator and condenser

After the condenser

Before the compressor

A

Between the compressor and condenser

88
Q

In the picture the valve is in what position:

The valve is closed

The valve position cannot be determined

The valve is cracked open

The valve is fully opened

A

The valve is cracked open

89
Q

A high-side float valve is used to maintain:

Constant level of refrigerant in the evaporator

Constant rate of refrigerant flow

Constant flow of condenser water

Constant level of refrigerant in condenser

A

Constant level of refrigerant in the evaporator

90
Q

A facility has failed to maintain water treatment to a refrigerant system?

Clogging of the cooling tower

Increase in the condenser pressure

Corrosion of the cooling tower metals

Cavitation of condense water pumps

A

Increase in the condenser pressure

91
Q

Which of these compressors is not a positive displacement type compressor?

Rotary

Screw

Reciprocating

Centrifugal

A

Centrifugal

92
Q

Where is emergency power not required according to code?

Egress illumination

Data centers

Fire pumps

High rise elevators

A

Data centers

93
Q

There is a decrease in the efficiency of a reciprocating compressor. The most likely
caused by:

High suction pressure

Leaking suction valve

Low suction pressure

Leaking discharge line

A

Leaking suction valve

94
Q

The suction and discharge valve of the reciprocating compressor are mounted as follows?

Suction and discharge valve on the upper side of the plate

Suction and discharge valve below the valve plate

Discharge valves below the valve plate and suction valve above it

Discharge valve on top of the valve plate and suction valve below

A

Discharge valve on top of the valve plate and suction valve below

95
Q

You are the engineer running a 2000 ton (steam-driven turbine) centrifugal refrigeration system, a refrigeration system supplies chilled water to a college campus with multiple buildings. While making your rounds you notice that the discharge pressure of your condenser water pumps is significantly lower than the normal. Which following action would you avoid taking?

Put on a additional condenser water pump

Flush out the bucket strainer of the condenser water pump

Send your assistant to check for cooling tower level

Put on an additional surface condenser pump and lower the chilled water set point

A

Put on an additional surface condenser pump and lower the chilled water set point

96
Q

A water pump is discharge against head 92 feet of water, this approximately to a pressure of:

95 psi
20 psi
40 psi
180 psi

A

40psi

97
Q

Which one of the following will connect to the middle port on a gauge manifold?

Solenoid valve

King valve

Vacuum pump

Suction or discharge service
valves

A

Vacuum pump

98
Q

The most important reason for installing a muffler in reciprocating refrigerant machine is ?

Prevent compressor damage

Prevent condenser damage

To contain the compressor pulsation noise

To reduce velocity of the refrigerant

A

To reduce velocity of the refrigerant

99
Q

Of the following, the statement that most accurately characterize a hermetic compressor is that it?

Typically has a pressure lubrication system

Will have only the motor enclosed in a gas tight housing

Will have both the compressor and motor enclosed is gas tight housing

Is erected in the field

A

Will have both the compressor and motor enclosed is gas tight housing

100
Q

The use of oil in the refrigeration machine is to:

Mix the oil with liquid refrigerant

Add non condensables to refrigerant

Reduce wear and friction in the compressor parts

None of the above

A

Reduce wear and friction in the compressor parts

101
Q

The following is a desirable property in a refrigeration?

High corresponding operation pressure

High viscosity

High latent heat

High corresponding compressor discharge temperature

A

High latent heat

102
Q

The cooling medium for an evaporative condenser is:

Air and water

Air

Water

Condenser fan

A

Air and water

103
Q

The ratio of the actual pressure of water vapor in the atmosphere to the saturated
pressure give temperature is?

Partial pressure

Humidly affect

Absolute humidity

Relative humidity

A

Partial pressure

104
Q

The only refrigerant/temperature chart available to a refrigerant engineer list the temperature is degrees Celsius if the chart indicates a Celsius temperature of 4 degrees to
equivalent to F?

35.2 degrees
39.2 degrees
27.0 degrees
18.4 degrees

A

39.2 degrees

105
Q

A refrigerant engineers was instructed to charge of 60 ton plant with R134A Refrigerant.
The refrigerant engineer will most likely find the charging valve on the

Discharge side of the compressor

Receiver

High side pressure side of the system

Low pressure side of the system

A

Low pressure side of the system

106
Q

A refrigerant engineer verifies that a chilled water pump is cavitating. Of the following
the most likely cause for this condition is:

A faulty cooling tower water level controller

Operating at sustaining high loads

Too long a period between pump servicing

Water leaks through the mechanical seals

A

Water leaks through the mechanical seals

107
Q

Hoy would you put an additional pump online?

Open suction valve, open discharge valve gradually

Open suction valve, close discharge valve

Close suction valve, open discharge valve

Open suction valve and slowly close discharge valve

A

Open suction valve, open discharge valve gradually

108
Q

Of the following, the major advantage of a shell and coil condenser is:

It is easier to clean without disturbing the refrigerant connection

There is less dangers of developing leaks

Has higher heat transfer coefficient

Better level liquid control all the condenser may be activated

A

There is less dangers of developing leaks

109
Q

A chill water system uses refrigerant R134 a leak in the evaporator shell may result in?

Set off the refrigerant monitor alarm

Higher than normal high side pressure

The foam of ice around the point of leak

Low pressure shut down

A

Set off the refrigerant monitor alarm

110
Q

What are steam ejectors used for on the surface condenser of a system with a turbine?

To regulate turbine speed

To increase the surface area of the condenser

To create a proper operating exhaust vacuum

To remove steam condensate from the condenser

A

To create a proper operating exhaust vacuum

111
Q

Water and moisture is a serious problem in a refrigerant system how to avoid?

Use of fins in refrigerant line

Proper evacuation at the charging of the system

Proper handling of refrigerant and oil to avoid exposure to mixture

Use of high viscosity oil in the connection

A

Proper evacuation at the charging of the system

112
Q

The most important requirements for a good evaporator is that?

Air or liquid refrigerant can be used as required by the medium being cooled

It must have enough cooling surface to absorb the required heat

Operates only when the heat load exceeds a minimum

The refrigerant is contained in tubes

A

It must have enough cooling surface to absorb the required heat

113
Q

While on duty a refrigeration engineer notice that the suction line to the compressor
and part of the compressor itself is frosted of the following, the most likely reason for this
condition would be?

Low condenser water temperature

The TEV is almost close

There is a blockage in the liquid line

There is not enough refrigerant in the system

A

There is not enough refrigerant in the system

114
Q

While doing a routine line inspection, the engineer notices the bulb of the TXV on the
floor refrigerant engineer should attach bulb at the?

Three quarters way towards the end of the coil

The inlet end of the coil

The expansion valve outlet

The outlet end of the coil

A

The outlet end of the coil

115
Q

Hoy would you put an additional pump online?

Open suction valve, open discharge valve gradually

Open suction valve, close discharge valve

Close suction valve, open discharge valve

Open suction valve and slowly close discharge valve

A

Open suction valve, open discharge valve gradually

116
Q

Of the following, the major advantage of a shell and coil condenser is:

It is easier to clean without disturbing the refrigerant connection

There is less dangers of developing leaks

Has higher heat transfer coefficient

Better level liquid control all the condenser may be activated

A

There is less dangers of developing leaks

117
Q

A chill water system uses refrigerant R134 a leak in the evaporator shell may result in:

Set off the refrigerant monitor alarm

Higher than normal high side pressure

The foam of ice around the point of leak

Low pressure shut down

A

Set off the refrigerant monitor alarm

118
Q

What are steam ejectors used for on the surface condenser of a system with a turbine:

To regulate turbine speed

To increase the surface area of the condenser

To create a proper operating exhaust vacuum

To remove steam condensate from the condenser

A

To create a proper operating exhaust vacuum

119
Q

Water and moisture is a serious problem in a refrigerant system how to avoid:

Use of fins in refrigerant line

Proper evacuation at the charging of the system

Proper handling of refrigerant and oil to avoid exposure to mixture

Use of high viscosity oil in the connection

A

Proper evacuation at the charging of the system

120
Q

The most important requirements for a good evaporator is that:

Air or liquid refrigerant can be used as required by the medium being cooled

It must have enough cooling surface to absorb the required heat

Operates only when the heat load exceeds a minimum

The refrigerant is contained in tubes

A

It must have enough cooling surface to absorb the required heat

121
Q

The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the
following, a more efficient centrifugal compressor operation results from:

Raising the condenser liquid level to the maximum

Lowering the chilled water set point

Raising the condenser head pressure

Lowering the condensing pressure

A

Lowering the condensing pressure

122
Q

The heat removed from the refrigerant in a condenser is:

Sensible and latent heat

Latent heat only

Radiant heat only

Sensible heat only

A

Sensible and latent heat

123
Q

The refrigerant unit that you have been assigned to is being taken out of service for a major
repair. You have been assigned to withdraw refrigerant for storage in suitable containers.
According to the NYC fire code, you must ensure that the containers:

Do not weigh more than 200 pounds when filled

Are approved by the US Department of Transportation

Are approved by the OSHA Association

Do not exceed 55 Gallon in Capacity

A

Are approved by the US Department of Transportation

124
Q

Which of the following best describes how the cylinder unloader work?

Keep in the suction valve opened while the compressor is in the return stroke

Controls the clearance volume in the compressor with a solenoid

Controls the opening of the passage into the compressor with variable vanes

Unloads the piston to create less pressure

A

Keep in the suction valve opened while the compressor is in the return stroke

125
Q

In most semi Hermetic compressors, the suction vapor is used to:

Removes oil from the motor housing

Cools the motor

Minimizes oil foaming

Removes oil foam from the shaft

A

Cools the motor

126
Q

The amount of refrigerant that flows through the orifices of a economizer is determined by the:

Number of economizer stages

Temperature of the high side refrigerant

Number of compressor stages

Difference between the high side and low side pressure

A

Difference between the high side and low side pressure

127
Q

The installation of an inline refrigerant cleaning system is advisable:

For high pressure refrigerant systems

To purge non-condensables

For systems using toxic refrigerant

To remove impurities from the system

A

To remove impurities from the system

128
Q

The type of refrigerant system that is least likely to leak refrigerant into the building space that
are being cooled:

The direct vented closed system

The direct closed system

Any system using reciprocating compressor

The indirect system

A

The indirect system

129
Q

The suction pressure of a reciprocating compressor is 65 PSG. The discharge pressure of this compressor is 120 PSIG. The atmospheric is 14.7 PSI. The compression ratio for the given
condition is closest to:

2.07

4,41

1.69

1.84

A

1.69

130
Q

A superheated vapor is a:

Dry vapor at the saturation temperature

Dry saturated vapor

Dry vapor above the saturation temperature

Vapor with minimal amount of included liquid

A

Dry vapor above the saturation temperature

131
Q

A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following the
most likely cause for this condition is:

A faulty cooling tower water level controller

Operating at sustaining high loads

Too long a period between pump servicing

Refrigerant leaks through the pumps packing

A

A faulty cooling tower water level controller

132
Q

A centrifugal water pump is known as a lift pump when the:

The pump lifts the water into the pump upon startup

The water supply to the pump suction inlet is below the pump level

The discharge head exceed 150 feet

The pump is started with the suction valve open

A

The water supply to the pump suction inlet is below the pump level

133
Q

A TXV is used to maintain constant:

Refrigerant flow

Evaporator pressure

Evaporator pressure drop

Evaporator superheat

A

Evaporator superheat

134
Q

The chilled water supply to the building is 55F. If the chiller is being used for human comfort, should you be concerned about this, and why?

Yes, this temperature is too low for human comfort purpose

Yes, this temperature is too high for human comfort purpose

No, 55F is within an acceptable range

No, temperature gauges often give false high readings

A

Yes, this temperature is too high for human comfort purpose

135
Q

The packing gland of a centrifugal pump serves to:

Keep the bearing cooled

Keeps air out of the pumps when the impeller housing is under negative pressure

The drip part of the packing gland gives evidence that there is water in the pump

All of the answers are correct

A

The drip part of the packing gland gives evidence that there is water in the pump

136
Q

Capacity control of a reciprocating hermetic compressor is typically achieved through.

Regulating the opening of the discharge valve

Variation of the condenser water temperature

Regulating the opening of the TXV

Operation of the hot gas bypass valve

A

Operation of the hot gas bypass valve

137
Q

The most important reason to sub-cool the refrigerant in the condenser is to ensure that:

A pure liquid refrigerant will enter the metering device

Liquid slugs will not enter the compressor

The condenser is working efficiently

The cooling tower has sufficient water

A

A pure liquid refrigerant will enter the metering device

138
Q

A refrigeration engineer is logging reading from a reciprocating system, compressor discharge
temperature have dropped significantly and the suction line pressure is high. Which of the following that may be causing this set of conditions

Compressor cycle

An expansion valve that is open to wide

Malfunction of a unloader

An expansion valve that is closed to much

A

An expansion valve that is open to wide

139
Q

A low side float valve is used to maintain:

A constant refrigerant flow

The water level in the cooling towers

The level of refrigerant in the condenser

The level of the refrigerant in the evaporator

A

The level of the refrigerant in the evaporator

140
Q

Regarding fire safety, which ASHRAE refrigerant safety classification indicates no flammability and lower toxicity?

A3

A1

B1

B2

A

A1

141
Q

When an expansion valve is operating properly, at the end of the evaporator will contain:

Saturated liquid refrigerant

Only liquid refrigerant

Only vapor

Only superheated vapor

A

Only superheated vapor

142
Q

What information is not contained in a Material Safety Data Sheet?

Health and physical hazards of the material

Safety work practice and required protective equipment of the material

Procedures that should be followed in case of an emergency

Cost of the material

A

Cost of the material

143
Q
  1. In a steam turbine, what is the function of the Kingsbury thrust bearing.

Maintain axial positioning of the rotor shaft

Maintain first stage steam pressure

Compensate for coupling misalignment

Adjust shaft torque at start up

A

Maintain axial positioning of the rotor shaft

144
Q

A centrifugal water pump is considered to be fully primed when.

The pump is full of air

Liquid or leaking past the packing gland

The pump runs with no knocking noise

The pump is full of liquid

A

The pump is full of liquid

145
Q

Copper tubing refrigerant lines must be installed for a new system. It is a well known service practice that tubing collapses at bends that must be made, the refrigerant engineer should use.

Brazed elbows

Annealed tubing

Never type tubing bender

A very small bend radius

A

Never type tubing bender

146
Q

A reciprocating compressor is making a knocking sound during operation. If the refrigerant worn
parts are not causing the knocking, what is probably the cause.

Misalignment of the compressor motor

The slugging of the liquid refrigerant

Parallel misalignment of the compressor and motor

Insufficient lubrication

A

The slugging of the liquid refrigerant

147
Q

In order for a refrigerant to become superheated it must be heated in a section of the low side refrigerant line:

Where the medium being cooled is hottest

Where refrigerant pressure is lowest

Where no liquid refrigerant is present

A

Where no liquid refrigerant is present

148
Q

All Liquid has been recovered from a system to be overhauled, the system.

Should not be opened until all vapor has been recovered

Should have air pumped through it and vented to atmosphere before being opened

Should be pumped with dry nitrogen before being opened

Can be safety opened and repaired

A

Should not be opened until all vapor has been recovered

149
Q
  1. When a refrigerant engineer uses a portable compressor recovery unit to remove vapor refrigerant form a refrigeration system the removal rate of the refrigerant will gradually slow down because.

The vapor density is decreasing

The refrigerant temperature is dropping

The compressor speed decreasing

The compressor efficiency is decreasing

A

The vapor density is decreasing

150
Q

You are the engineer running a 2000-ton (steam-driven turbine) centrifugal refrigeration system,
a refrigeration system supplies chilled water to a college campus with multiple buildings. During the course of making your rounds, you check the 9 cell cooling tower on the roof. You note the water level in all of the cooling tower cells is very low. Which one of the following immediate
action would take?

Gradually lower the chiller water set point on the refrigerant system

Add additional make up water to cooling tower

Create a deeper vacuum pressure in the surface condenser and turn on a second condensate pump

Drastically increase the speed of the cooling tower

A

Add additional make up water to cooling tower

151
Q

A rooftop water cooling tower is connected to a water pump in the building basement with a 12
inches diameter pipe with the pump turn off, a pressure gauge at the pumps inlet show a
pressure of 140 PSIG the height of the water column, in feet, would be closest to?

277

375

323

190

A

323

152
Q

What device protects the steam turbine from excessive speed?

Governor assembly

Maximum speed set point control

High steam flow cutout

Double seat globe valve

A

Governor assembly

153
Q

A refrigeration compressor has failed to turn on. The refrigeration engineer on duty verifies that
the electrical circuit to the motor, including all switches and circuit breakers, is complete according to recommended service practice, the next item to be checked would likely be the:

Temperature and pressure controls

Liquid line solenoid valve

Refrigerant charge

Cooling tower operation

A

Temperature and pressure controls

154
Q

Refrigerants are characterized by their physical properties included flashpoint, refrigeration
effect, and others of the refrigerants in commercial and industrial the highest latent heat and
refrigerant effect is:

R-12

Ammonia

R-22

Propane

A

Ammonia

155
Q

On what characteristics is ASHRAE refrigerant safety group classification system:

Explosives and toxicity

Explosives and flammability

Flammability and toxicity

Acidity and explosiveness

A

Flammability and toxicity

156
Q

Of the following, and example of an in-line refrigerant cleaning system that may be used with a
centrifugal compressor containing R123 refrigerant is:

Refrigerant recycling

Refrigerant recovery

Refrigerant reclaiming

Refrigerant disposal

A

Refrigerant recycling

157
Q

Information about the physical and chemical properties of a hazardous material can be found in:

NY Medical code

Manufacturers Safety
Directions Sheet

Material Safety Data Sheet

NYC Fire Code

A

Material Safety Data Sheet

158
Q

What is the function of the turbine auxiliary oil pump?

Check proper oil level in pump before start up

Stand by pump if main pump fails

Recovers oil from the condensate tank

Establish oil pressure during turbine start up

A

Establish oil pressure during turbine start up

159
Q

The rupture disc for a low-pressure centrifugal refrigeration machine is normally located on the:

Compressor suction

Condenser

Compressor discharge

TXV

A

Compressor suction

160
Q

What is the primary reason ribbed metal piping is used for electrical wires connected to the refrigeration system shown below?

It is easier to install than non-ribbed metal piping

It allows the flexibility and accounts for vibrations

It allows for ventilating the heat from wires

It is less costly to use than non-ribbed metal piping

A

It allows the flexibility and accounts for vibrations

161
Q
  1. Modern compressors usually seal the rotating shaft as it exits the compressor housing a spring
    loaded seal made of .

Rubber

Low friction plastic

Metal or carbon

Graphite loaded fiber

A

Metal or carbon

162
Q

The British Thermal Unit (BTU) is the measurement of heat of energy. If 10 BTU are transferred to 10 pounds of water, the water temperature increase will be closest to:

10F

1C

1F

10C

A

1F

163
Q

A reciprocating compressor cylinder has a 10 inches bore and 14 inches stroke. The volume of refrigerant, in cubic inches, will be closer to:

1808

1406

1099

1002

A

1099

164
Q

An electrically operated control requires 24 volts to operate to change the available 110 volts to
24 volts.

Rectifier

Step-down capacitor

Low temperature wire

Transformer

A

Transformer

165
Q

In an indirect refrigeration system, of the following, the one that would not be used as a cooling medium for the building spaces being cooled is:

A calcium chloride solution

A sodium chloride solution

R22 refrigerant

Glycol

A

R22 refrigerant

166
Q

On a steam turbine, what would cause the atmospheric valve to open?

Low vacuum in the surface condenser

Leaking tubes in the surface condenser

All answers are correct

Dirty tubes in the surface condenser

A

All answers are correct

167
Q

You are the engineer running a 2000-ton (steam-driven turbine) centrifugal refrigeration system
a refrigeration system supplies chilled water to a college campus with multiple buildings making your rounds, you notice that condenser water pump #1 is making a lot of noise, the discharger gauge reading of the condenser water pump is fluctuating drastically, and motor of the condenser pump #1 is running very hot. Which of the following actions would you take:

Turn on pump #2, shut off pump #1, and trouble shot pump #1

Gradually increase the chilled water set point from 40F to 46F, so the machine can cool down

Leave pump #1 running, but immediately put in a call to the service contractor

A

Turn on pump #2, shut off pump #1, and trouble shot pump #1

168
Q

Electric devices may be used to provide built in defrosting of refrigeration machine evaporator units. These devises are classified as.

Induction coils

Thermostats

Capacitors

Resistors

A

Resistors

169
Q

The flash point of compressor lubrication oil:

Should be higher than the compression temperature

Is the temperature at which the oil start to foam

Is the temperature at which the viscosity is measured

Should be lower than the compression temperature

A

Should be higher than the compression temperature

170
Q

The primary way of achieving capacity control of a centrifugal compressor is by:

Variation in steam pressure

Adjustment of the impeller inlet pre-rotation vanes

Operation of the hot gas bypass valve

Adjustment of the thermal expansion valve

A

Adjustment of the impeller inlet pre-rotation vanes

171
Q

Cooling tower water requires the addition of chemical additives in order to:

Lower head pressure

Regulate and maintain the PH level

Reduce the formation of scale and algae

Comply with EPA regulation

A

Reduce the formation of scale and algae

172
Q

The viscosity of lubrication oil is described by a number. A low viscosity number describes oil that:

Flows easily

Should not be used with refrigerant

Flows poorly

Does not provide good lubrication

A

Flows easily

173
Q

The most likely reason for a refrigeration engineer to use a psychrometer is to measure

Atmosphere pressure

Relative humidity level of the atmosphere

Temperature of the atmosphere

Undesired substance in the atmosphere

A

Relative humidity level of the atmosphere

174
Q

The most important reason to use at least two compressors in a cascade system is to:

Accomplish higher temperature

Avoid very high compression ratio for each compressor

Avoid the need for water-cooled condenser

Divide the cooling load between the compressors

A

Avoid very high compression ratio for each compressor

175
Q
  1. The suction service valve of a reciprocating compressor is front seated and the compressor run
    until the low pressure cut-out shut the compressor off. When the machine is stopped, the refrigeration engineer notices that the suction pressure increase rapidly. The most probably
    cause this pressure rise:

A faulty gauge

A leaking suction service valve

All answers are correct

Malfunction of a compressor valve

A

Malfunction of a compressor valve

176
Q

Regarding the functioning of a steam turbine, why is it advisable to keep moisture in the inlet low as possible?

Decrease vacuum leaks

Decrease turbine warm up time

Keeps turbine blades wear to minimum

Keeps steam traps from rusting

A

Keeps turbine blades wear to minimum

177
Q

According to the attached Material Safety Data Sheet R134 is a?

Dark blue liquid

Clear, odorless liquid and vapor

Yellow gas that smells like rotten eggs

Light blue liquid

A

Clear, odorless liquid and vapor

178
Q

Under normal condition, the refrigerant enters the compressor as a:

Low pressure vapor and leaves as a high pressure saturated vapor

Low pressure superheated vapor and leaves as a high pressure vapor

Low pressure superheated vapor and leaves as a high pressure saturated liquid

High temperature vapor and leaves as a low pressure vapor

A

Low pressure superheated vapor and leaves as a high pressure vapor

179
Q

While operating an R-22 single acting compressor system, the refrigeration engineer noticed oil foaming in the crankcase. This condition most likely, would have been caused by a:

Sudden drop in the crankcase pressure

High oil temperature

Moisture in the oil

Addition of liquid Freon

A

Sudden drop in the crankcase pressure

180
Q

Assume that an engineer is able to observe refrigerant water and oil together. The fluids would settle in the container from top to bottom:

Water, oil, refrigerant

Oil, refrigerant, water

Refrigerant, oil, water

Oil, water, refrigerant

A

Oil, water, refrigerant

181
Q

What is the function of the vacuum breaker in a steam turbine.

To achieve a faster coast down cycle

To keep main bearing oil from foaming

To keep vacuum at proper level

To indicate presence of vacuum leak

A

To achieve a faster coast down cycle

182
Q

An equalizer line on a TXV is used to:

Eliminate the pressure across the evaporator

Compensate for the pressure drop across the evaporator coil

Equalize the pressure across the TXV diaphragm or below

Correct for pressure drop in the thermal bulb capillary lines

A

Compensate for the pressure drop across the evaporator coil

183
Q

If R134 accidentally touches a refrigerant engineer’s skin, what first aid should be applied from
the MSDS?

R134 is a low acute toxicity, no special medical attention is required

Promptly flush skin with water until all chemical is removed

Rub the frozen parts

The frostbite parts in hot water (above 130F) to warm them up

A

Promptly flush skin with water until all chemical is removed

184
Q

In a multi stage centrifugal compressor, each stage:

Has higher tip speed than one before it

Handles more refrigerant than the one before it

Is identical in volume to the other stages

Has smaller volume than the one before it

A

Is identical in volume to the other stages

185
Q

A refrigeration engineer notices excessive cycling of the temperature control for a reciprocating compressor refrigeration unit. The crankcase temperature is high, the compressor discharge temperature low, the suction line temperature is high of the following the one that may causing
this set of condition.

An expansion valve that is open too wide

The purge unit operation

The condenser operation, dirty tubes or cooling control

Faulty compressor valves

A

Faulty compressor valves

186
Q

On an operating centrifugal compressor refrigerant unit, the refrigeration engineer notices the compressor is short cycling. The unit is using low side float valve as a meeting device of the
following requirements this would indicate that:

Inspection should be made for a dirty and partially plugged discharge line

The system is undercharged with refrigerant

The compressor wiring be inspected

The system is overcharged with refrigerant

A

The system is undercharged with refrigerant

187
Q

The vessel depicted below may be used in connection with.

Refrigerant recovery

Refrigerant recycling

Refrigerant reclaiming

Refrigerant disposal

A

Refrigerant recovery

188
Q

A refrigeration system used jet ejector to raise settled oil mixed with refrigerant to the oil pump if a restriction in the refrigerant flow to the jet ejector develops:

The flow of oil will be unaffected

The temperature of the refrigerating exiting the jet will decrease

The oil will not lift if it is mixed with less refrigerant

There may be insufficient head to lift the oil

A

There may be insufficient head to lift the oil

189
Q
  1. An indirect low temperature refrigerant system frequently uses glycol, instead of salt brine as the intermediate cooling medium. An advantage of this choice is:

The elimination of corrosion

High flow rate

Better thermal conduction

Low cost

A

The elimination of corrosion

190
Q

In relation to the suction pressure of a compressor, the reading on the oil pressure gauge should
read in the range closer to:

15 to 30 PSI higher

15 to 30 PSI lower

30 to 60 PSI lower

60 to 80 PSI higher

A

15 to 30 PSI higher

191
Q

Non-condensable gases like air, oil vapor, or nitrogen travel through a refrigerant system with the refrigerant they usually accumulate in the:

Condenser

Compressor crankcase

Filter drier

Evaporator

A

Condenser

192
Q

The advantage of forced draft cooling tower over natural draft cooling towers is:

Smaller tower size

That it uses less water

That it improves power efficiency in water tower

Reduced energy cost

A

Smaller tower size

193
Q

The sole refrigeration engineer on duty in a building is permitted to leave the building refrigeration system when it is in operation only when:

Lunch or dinner occur

System is an automatic operation

Relieved by another licensed refrigeration engineer

The assistant provides coverage or supervision

A

Relieved by another licensed refrigeration engineer

194
Q

A system controlled by a TXV show high discharge pressure and high normal sub-cooling. The cause is most probably a:

Superheat settings that has been set incorrectly

Refrigerant overcharge

Leaking compressor discharge valve

Low system amperage draw

A

Refrigerant overcharge

195
Q

Which of the following is a correct statement?

2.5 gallon of water weight 10.7 pounds

2.5 gallon of water weight 1.05 pounds

2.5 gallons of water weighs 20.8 pounds

2.5 gallons of water 2.5 cubic feet

A

2.5 gallons of water weighs 20.8 pounds

196
Q

Liquid level gauge glasses (except the bulls eye) are generally equipped with:

Manual and automatic closing shut off valves

Manual shut-off valves only

Automatic shut-off valves only

Either manual or automatic closing shut-off valves

A

Automatic shut-off valves only

197
Q

Copper and aluminum are frequently used for condenser tubes in refrigeration system, these
metals are used because of there:

Easy availability

High heat transfer coefficient

Resistance to corrosion

Resistance to failing

A

High heat transfer coefficient

198
Q

Assume that a refrigeration engineer has a choice of four valves to select from. Which of the following is the most effective type of valve to control pressure?

Ball valve

Quarter turn valve

Gate valve

Plug valve

A

Plug valve

199
Q

Where must the Material Safety Data Sheets be located?

Near the entrance to the machine room

Where flammable liquids are used

Where available to all employees

A

Where available to all employees

rmo review 1 (11 decks)

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